The Hawaii Natural History Association, a nonprofit organization devoted to aiding the park interpretive program, has produced several other booklets to help you enjoy the parks in Hawaii. These may be obtained at headquarters in either park or by writing directly to the association, Hawaii Volcanoes National Park, Hawaii.

Haleakala Guide, by George C. Ruhle, $1.00

Ferns of Hawaii National Park, by Douglass H. Hubbard, 50¢

Trailside Plants of Hawaii National Park, by Douglass H. Hubbard and Vernon R. Bender, Jr., 50¢

Volcanoes of the National Parks in Hawaii, by Gordon A. MacDonald and Douglass H. Hubbard, 50¢